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// Copyright 2009 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. //go:build !faketime #include "go_asm.h" #include "textflag.h" #include "time_windows.h" TEXT time·now(SB),NOSPLIT,$0-20 loop: MOVL (_INTERRUPT_TIME+time_hi1), AX MOVL (_INTERRUPT_TIME+time_lo), CX MOVL (_INTERRUPT_TIME+time_hi2), DI CMPL AX, DI JNE loop // w = DI:CX // multiply by 100 MOVL $100, AX MULL CX IMULL $100, DI ADDL DI, DX // w*100 = DX:AX MOVL AX, mono+12(FP) MOVL DX, mono+16(FP) wall: MOVL (_SYSTEM_TIME+time_hi1), CX MOVL (_SYSTEM_TIME+time_lo), AX MOVL (_SYSTEM_TIME+time_hi2), DX CMPL CX, DX JNE wall // w = DX:AX // convert to Unix epoch (but still 100ns units) #define delta 116444736000000000 SUBL $(delta & 0xFFFFFFFF), AX SBBL $(delta >> 32), DX // nano/100 = DX:AX // split into two decimal halves by div 1e9. // (decimal point is two spots over from correct place, // but we avoid overflow in the high word.) MOVL $1000000000, CX DIVL CX MOVL AX, DI MOVL DX, SI // DI = nano/100/1e9 = nano/1e11 = sec/100, DX = SI = nano/100%1e9 // split DX into seconds and nanoseconds by div 1e7 magic multiply. MOVL DX, AX MOVL $1801439851, CX MULL CX SHRL $22, DX MOVL DX, BX IMULL $10000000, DX MOVL SI, CX SUBL DX, CX // DI = sec/100 (still) // BX = (nano/100%1e9)/1e7 = (nano/1e9)%100 = sec%100 // CX = (nano/100%1e9)%1e7 = (nano%1e9)/100 = nsec/100 // store nsec for return IMULL $100, CX MOVL CX, nsec+8(FP) // DI = sec/100 (still) // BX = sec%100 // construct DX:AX = 64-bit sec and store for return MOVL $0, DX MOVL $100, AX MULL DI ADDL BX, AX ADCL $0, DX MOVL AX, sec+0(FP) MOVL DX, sec+4(FP) RET